when to fertilize rhododendrons northwest

Best answer


Rhododendrons and azaleas prefer slightly acid soils. Fertilizer is best appliedsoon after flowering in the spring. Organic fertilizers are a bit more costly, but are released slowly and need to be applied less frequently than chemical fertilizers. Do not apply fertilizer after mid-July, or the plant may not be completely dormant by winter.

People also ask


  • When should I fertilize my Rhododendron?

  • You can start fertilizing rhododendron bushes at planting time, and do it again in early spring as flower buds swell. Use a light hand, since applying too much rhododendron fertilizer can do more harm than good. Sprinkle on once again very lightly at leaf emergence if the new leaves look pale.

  • When should I fertilize my azaleas in South Africa?

  • In less fertile soils, a complete fertilizer designed for acid-loving plants may be applied in late winter or early spring. Be careful to use only the amounts recommended for rhododendrons and azaleas, which do not need as much fertilizer as other plants.

  • What is the best fertilizer for azaleas and rhododendrons?

  • You may notice some fertilizers in the garden store specifically for azaleas and rhododendrons. These specialty fertilizers are formulated with ammonium sulfate to acidify the soil at the same time as providing nitrogen. If your soil is naturally acid, no need to buy these expensive specialty products for feeding your rhodies.

  • When is the best time to take care of rhododendrons and azaleas?

  • AURORA – Rhododendrons and azaleas herald spring in Oregon. And spring is a good time to give these beautiful shrubs the care they deserve. There are a number of things home gardeners can do to keep rhodies and azaleas long-lived and healthy, according to Jan McNeilan, retired horticulturist with Oregon State University Extension Service.

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